A new video has surfaced, threatening the upcoming Winter Olympics in Sochi, Russia.

The video, posted by group Ansar al Sunah on a militant Chechen site, shows two young men who are believed to have been bombers in the December 2013 Volgograd attacks, ABC News reported

The two men warned that as long as President Vladimir Putin occupies the North Caucasus region near Sochi, Russians and Olympic visitors alike will not be safe.

‘We’ll have a surprise package for you,’ one of the men said in the video, according to the ABC report. ‘And those tourists that will come to you, for them, too, we have a surprise. If it happens [the Olympics], we’ll have a surprise for you. This is for all the Muslim blood that is shed every day around the world, be it in Afghanistan, Somalia, Syria, all around the world. This will be our revenge.’

U.S. authorities are examining the video — but an official told USA Today that ‘there was no definitive evidence’ to indicate whether the men shown in the video were actually tied to the Volgograd bombings, which killed more than 30 people.